.container{
    width: 1200px;
    margin: 0 auto;
}
.container-fuild{
    width: 100%;
}
.bd {
    border: 1px solid black;
}

.fr {
    float: right;
}

.fl {
    float: left;
}

.clearfix:after{
    content: "";
    height: "";
    display: block;
    clear: both;
}